The discovery of the fungicide known as Bordeaux mixture is associated with which of the following diseases?

The electronic configuration of $Yb^{2+}$ is:

Which of the following parts of a neuron is covered by a fatty sheath?

In an experiment with $15$ observations on $x$,the following results were available: $\sum x^2 = 2830$ and $\sum x = 170$. One observation that was $20$ was found to be wrong and was replaced by the correct value $30$. Then the corrected variance is:

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

The ratio $C_p/C_v$ for a gas mixture consisting of $8 \ g$ of helium and $16 \ g$ of oxygen is